BEGIN{
}

{
  if ($3 != county)
    flag = 1

  if (flag == 1){
    gr[NR] = 0
    value[NR] = $6
    print $0, gr[NR]
    flag = 0
    county = $3
    next
  }

  gr[NR] = ($6-value[NR-1])/value[NR-1]
  value[NR] = $6
  print $0, gr[NR]
}


